| /* ------------------------------------------------------------------ |
| * Copyright (C) 1998-2009 PacketVideo |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either |
| * express or implied. |
| * See the License for the specific language governing permissions |
| * and limitations under the License. |
| * ------------------------------------------------------------------- |
| */ |
| /**************************************************************************************** |
| Portions of this file are derived from the following 3GPP standard: |
| |
| 3GPP TS 26.073 |
| ANSI-C code for the Adaptive Multi-Rate (AMR) speech codec |
| Available from http://www.3gpp.org |
| |
| (C) 2004, 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TTA, TTC) |
| Permission to distribute, modify and use this file under the standard license |
| terms listed above has been obtained from the copyright holder. |
| ****************************************************************************************/ |
| /* |
| |
| Filename: /audio/gsm_amr/c/include/lsp_avg.h |
| |
| ------------------------------------------------------------------------------ |
| REVISION HISTORY |
| |
| Description: Placed header file in the proper template format. Added |
| parameter pOverflow for the basic math ops. |
| |
| Description: Moved _cplusplus #ifdef after Include section. |
| |
| Who: Date: |
| Description: |
| |
| ------------------------------------------------------------------------------ |
| INCLUDE DESCRIPTION |
| |
| This file contains all the constant definitions and prototype definitions |
| needed by the lsp_avg.c |
| |
| ------------------------------------------------------------------------------ |
| */ |
| |
| /*---------------------------------------------------------------------------- |
| ; CONTINUE ONLY IF NOT ALREADY DEFINED |
| ----------------------------------------------------------------------------*/ |
| #ifndef int_lpc_h |
| #define int_lpc_h "$Id $" |
| |
| /*---------------------------------------------------------------------------- |
| ; INCLUDES |
| ----------------------------------------------------------------------------*/ |
| #include "typedef.h" |
| |
| /*--------------------------------------------------------------------------*/ |
| #ifdef __cplusplus |
| extern "C" |
| { |
| #endif |
| |
| /*---------------------------------------------------------------------------- |
| ; MACROS |
| ; Define module specific macros here |
| ----------------------------------------------------------------------------*/ |
| |
| /*---------------------------------------------------------------------------- |
| ; DEFINES |
| ; Include all pre-processor statements here. |
| ----------------------------------------------------------------------------*/ |
| |
| /*---------------------------------------------------------------------------- |
| ; EXTERNAL VARIABLES REFERENCES |
| ; Declare variables used in this module but defined elsewhere |
| ----------------------------------------------------------------------------*/ |
| |
| /*---------------------------------------------------------------------------- |
| ; SIMPLE TYPEDEF'S |
| ----------------------------------------------------------------------------*/ |
| |
| /*---------------------------------------------------------------------------- |
| ; ENUMERATED TYPEDEF'S |
| ----------------------------------------------------------------------------*/ |
| |
| /*---------------------------------------------------------------------------- |
| ; STRUCTURES TYPEDEF'S |
| ----------------------------------------------------------------------------*/ |
| |
| /*---------------------------------------------------------------------------- |
| ; GLOBAL FUNCTION DEFINITIONS |
| ; Function Prototype declaration |
| ----------------------------------------------------------------------------*/ |
| |
| /* |
| ************************************************************************** |
| * |
| * Function : Int_lpc_1and3 |
| * Purpose : Interpolates the LSPs and converts to LPC parameters |
| * to get a different LP filter in each subframe. |
| * Description : The 20 ms speech frame is divided into 4 subframes. |
| * The LSPs are quantized and transmitted at the 2nd and |
| * 4th subframes (twice per frame) and interpolated at the |
| * 1st and 3rd subframe. |
| * |
| * |------|------|------|------| |
| * sf1 sf2 sf3 sf4 |
| * F0 Fm F1 |
| * |
| * sf1: 1/2 Fm + 1/2 F0 sf3: 1/2 F1 + 1/2 Fm |
| * sf2: Fm sf4: F1 |
| * Returns : void |
| * |
| ************************************************************************** |
| */ |
| void Int_lpc_1and3( |
| Word16 lsp_old[], /* i : LSP vector at the 4th subfr. of past frame (M) */ |
| Word16 lsp_mid[], /* i : LSP vector at the 2nd subfr. of |
| present frame (M) */ |
| Word16 lsp_new[], /* i : LSP vector at the 4th subfr. of |
| present frame (M) */ |
| Word16 Az[], /* o : interpolated LP parameters in all subfr. |
| (AZ_SIZE) */ |
| Flag *pOverflow |
| ); |
| |
| /* |
| ************************************************************************** |
| * |
| * Function : Int_lpc_1and3_2 |
| * Purpose : Interpolation of the LPC parameters. Same as the Int_lpc |
| * function but we do not recompute Az() for subframe 2 and |
| * 4 because it is already available. |
| * Returns : void |
| * |
| ************************************************************************** |
| */ |
| void Int_lpc_1and3_2( |
| Word16 lsp_old[], /* i : LSP vector at the 4th subfr. of past frame (M) */ |
| Word16 lsp_mid[], /* i : LSP vector at the 2nd subframe of |
| present frame (M) */ |
| Word16 lsp_new[], /* i : LSP vector at the 4th subframe of |
| present frame (M) */ |
| Word16 Az[], /* o :interpolated LP parameters |
| in subframes 1 and 3 (AZ_SIZE) */ |
| Flag *pOverflow |
| ); |
| |
| /* |
| ************************************************************************** |
| * |
| * Function : Int_lpc_1to3 |
| * Purpose : Interpolates the LSPs and converts to LPC parameters |
| * to get a different LP filter in each subframe. |
| * Description : The 20 ms speech frame is divided into 4 subframes. |
| * The LSPs are quantized and transmitted at the 4th |
| * subframes (once per frame) and interpolated at the |
| * 1st, 2nd and 3rd subframe. |
| * |
| * |------|------|------|------| |
| * sf1 sf2 sf3 sf4 |
| * F0 F1 |
| * |
| * sf1: 3/4 F0 + 1/4 F1 sf3: 1/4 F0 + 3/4 F1 |
| * sf2: 1/2 F0 + 1/2 F1 sf4: F1 |
| * Returns : void |
| * |
| ************************************************************************** |
| */ |
| void Int_lpc_1to3( |
| Word16 lsp_old[], /* i : LSP vector at the 4th SF of past frame (M) */ |
| Word16 lsp_new[], /* i : LSP vector at the 4th SF of present frame (M) */ |
| Word16 Az[], /* o : interpolated LP parameters in all SFs (AZ_SIZE) */ |
| Flag *pOverflow |
| ); |
| |
| /* |
| ************************************************************************** |
| * |
| * Function : Int_lpc_1to3_2 |
| * Purpose : Interpolation of the LPC parameters. Same as the Int_lpc |
| * function but we do not recompute Az() for subframe 4 |
| * because it is already available. |
| * Returns : void |
| * |
| ************************************************************************** |
| */ |
| void Int_lpc_1to3_2( |
| Word16 lsp_old[], /* i : LSP vector at the 4th SF of past frame (M) */ |
| Word16 lsp_new[], /* i : LSP vector at the 4th SF present frame (M) */ |
| Word16 Az[], /* o :interpolated LP parameters in SFs 1, 2, 3 |
| (AZ_SIZE) */ |
| Flag *pOverflow |
| ); |
| |
| /*---------------------------------------------------------------------------- |
| ; END |
| ----------------------------------------------------------------------------*/ |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| #endif /* _INT_LPC_H_ */ |
| |
| |
